StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics
https://doi.org/10.1109/TVCG.2020.3030352
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55 lines
1.4 KiB
55 lines
1.4 KiB
4 years ago
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# glsl-specular-beckmann
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Computes the specular power from the Beckmann distribution
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# Example
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```glsl
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#pragma glslify: beckmann = require(glsl-specular-beckmann)
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uniform vec3 eyePosition;
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uniform vec3 lightPosition;
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uniform float roughness;
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varying vec3 surfacePosition;
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varying vec3 surfaceNormal;
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void main() {
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vec3 eyeDirection = normalize(eyePosition - surfacePosition);
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vec3 lightDirection = normalize(lightPosition - surfacePosition);
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vec3 normal = normalize(surfaceNormal);
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float power = beckmann(lightDirection, viewDirection, normal, roughness);
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gl_FragColor = vec4(power,power,power,1.0);
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}
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```
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# Usage
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Install with npm:
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```
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npm install glsl-specular-beckmann
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```
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Then use with [glslify](https://github.com/stackgl/glslify).
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# API
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```glsl
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#pragma glslify: beckmann = require(glsl-specular-beckmann)
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```
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##### `float beckmann(vec3 lightDir, vec3 eyeDir, vec3 normal, float shininess)`
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Computes the specular power in the Beckmann model
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* `lightDir` is a *unit length* `vec3` pointing from the surface point toward the light
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* `eyeDir` is a *unit length* `vec3` pointing from the surface point toward the camera
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* `normal` is the surface normal at the sample point
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* `roughness` is a parameter between 0 and 1 measuring the surface roughness. Small values are shinier, larger values are rougher.
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**Returns** A `float` representing the specular power
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# License
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(c) 2014 Mikola Lysenko. MIT License
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